Protecting piles against worms, &amp;c.



PHILIP APFEL, OF SEATTLE,

WASHINGTON, AND RALPH L. EARNEST, OF PORTLAND,

OREGON.

PROTECTING FILES AGAINST WORKS, &c.

Specification of Letters Patent.

Patented March 31,, 1908.

Application filed July 27, 1907. Serial No. 386,768.

.T all whom it may concern:

Be it known that we, PHILIP F. APFEL, a citizen of the United States,residing in Seattle, in the county of .King and State of Washington, andRALPH L. Ennnns'r, a citizen of the United States, residingin Portland,in

the county of Multnomah and State of Oregon, have invented a new anduseful Imposition we apply provement in the. Art of Protecting PilesAgainst Worms, &c., of which the following is a specification.

This invention relates to an improved method of rendering the piles usedin-salt water docks and wharves proof against the teredo and otherdestructive worms and insects. a

We have discovered the fact that a certain composition or cement knownto us possesses the ability to repel'the teredo and other boring wormsand insects with which the piles used in docks, wharves and otherstructures located on salt water are infested, and our improvement inthe art of preserving such piles consists in coating or otherwisecovering them with said composition or cement.

In thepreparation of the composition, we take magnesium carbonate andmagnesium oxid and mix them with aqueous magnesium chlorid adding asuitable filler such as gypsum, sand, asbestos or the like, producing amixture of the desired consistency and adapted to be spread upon thepiles. This comto.the piles either with a trowel or in some othersuitable 'way, coating them with the com osition which .becomes hardsoon after a p ication. Orinstead of coating the piles irectly, we passcanvas or burlap through the mixture so that the same becomes thoroughlycoated and saturated "with the paint, and then wrap this canvas orburlap around the piles and secure it thereto by nails, staples or othersuitable fastenlngs.

If desired, the piles may be covered and reinforced with wire cloth orexpanded metal mechanically fastened to them, before the paint or cementis applied.

*It will-be understood that we do not limit ourselves to the use of allthe ingredients above mentioned in the protecting composition,theessential' feature being that it embody some one or more of thestated forms of magnesium oxid.

We claim In the process of preserving wood used in contact with saltwater, the im rovement which consists in applying to t e surface thereofa composition consisting of magnesium carbonate, magnesium oxid, anaqueous mixture'of magnesium chlorid, and a suitablefiller.

PHI-LIP F. APFEL. RALPH L. EARNEST. Witnesses as to Philip F; Ap-fel:

ELMER E. HARRISON, CLARE E. MURPHY. Witnesses as to Ralph L Earnest:-

WALLACE MCOAMANT, FRED "STEIWEI t.

